When will people learn … DO NOT MESS WITH SHARON OSBOURNE! The famous rock manager and Osbourne matriarch was embroiled in an argument at a Grammy week event with fellow music manager Jordan Feldstein that led to Osbourne throwing a plate of food at Feldstein.

A high-profile skirmish between two powerful managers has left one of them with a smaller revenue stream. Jordan Feldstein has been fired by one of his clients, Sara Bareilles, after clashing with Ozzy Osbourne manager and wife Sharon Osbourne.